Cheapest return flights from Ontario to San Juan in January from $381

AirHint found the following cheapest return flights from Ontario (ONT) to San Juan (SJU) in January 2026 (see full year).

Return flights

29 Jan - 02 Feb Frontier Airlines
30 Jan - 04 Feb Southwest Airlines
26 Jan - 02 Feb Frontier Airlines
29 Jan - 04 Feb Southwest Airlines
30 Jan - 03 Feb Southwest Airlines
25 Jan - 01 Feb Frontier Airlines
24 Jan - 27 Jan Southwest Airlines
29 Jan - 14 Feb Southwest Airlines
22 Jan - 25 Jan Southwest Airlines
25 Jan - 08 Feb Southwest Airlines

Also check the deals for one-way flights from Ontario to San Juan in January.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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